Restore Jailbroken iPhone 4 running 4.0.1

Hi guys, this is my first time posting and I am in desperate need of help!

I have a jailbroken iphone 4 running 4.0.1 with baseband 1.59.00. It was all good until I had to reboot my iphone, which was where the trouble started. It wont reboot normally and is stuck on the apple logo and will constantly loop.

I tried restoring it through iTunes with the stock ipsw 4.0.1 firmware from apple but it wont work since apple doesnt sign the firmwre anymore. I havent had the chance to back up my shsh and I have just tried to backing up my shsh by putting it in DFU/restore mode but Tinyumbrella wont recognize my iphone. I was wondering is there someway that I can back up my shsh onto my harddrive instead of cydia server and then do a restore in itunes? Is that method possible?

Please help me I am in desperate need of my phone to work again and to preserve both firmware and baseband. Thank you guys in advance!

Lets say I have a normally functoning and jailbroken iphone 4 with bb 1.59.00, is there a way to back up my shsh to cydia server now or has that window passed also? Sorry Ive been using my IP4 without a problem until now so I've been trying to catch up with all the new jailbreaking/unlocking methods since the problem arose. Please advise. Thanks!

You might have better luck posting in the JB section of the site? Sorry I can't help but this is exactly why I don't JB. Don't get me wrong I would love to but it always seems so complex and I don't want to brick it...